Topo zoom does not work on mobile

[killakalle]

I'm on Android + Chrome. Topo zoom does not work.

On Desktop:

Topo without zoom

Then click on the topo (the mouse changes to zoom icon on hover) and the topo zooms in

I can further zoom in using the built-in browser zoom

On mobile:

Topo without zoom (can hardly recognize anything)

Clicking on the topo does not zoom in - nothing happens.

I can only zoom in further using the built-in browser zoom.

In general, the usability of the topos on mobile is so-so. It depends a lot on the topo itself whether it works well on mobile. I hope that by enabling the zoom functionality on mobile, it would be a bit better.

PS: On the HTML Guide page, the zoom does not work either.

This ticket sounds like it might resolve a lot of the issues around topo zoom: #2871